test_stripe: Convert NamedTuple to dataclass.
test_stripe: Convert NamedTuple to dataclass.

The locally defined NamedTuple was triggering a mypy caching bug
(https://github.com/python/mypy/issues/10913), and we don’t use the
tuple behavior anyway.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulip.com>

hackerkid/zulip,rht/zulip,zulip/zulip,kou/zulip,kou/zulip,eeshangarg/zulip,hackerkid/zulip,zulip/zulip,zulip/zulip,andersk/zulip,andersk/zulip,kou/zulip,hackerkid/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,zulip/zulip,hackerkid/zulip,rht/zulip,eeshangarg/zulip,eeshangarg/zulip,eeshangarg/zulip,kou/zulip,zulip/zulip,eeshangarg/zulip,andersk/zulip,hackerkid/zulip,andersk/zulip,andersk/zulip,zulip/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,rht/zulip,hackerkid/zulip,kou/zulip,andersk/zulip,kou/zulip,zulip/zulip,hackerkid/zulip,rht/zulip,rht/zulip